For something quick and very silly that doesn't even need split screen or even multiple controllers, there's always DIVE KICK! The entertainment value isn't likely to be long, but for a few bucks off Steam and some easy laughs (because it's the simplest fighting game ever - only two buttons!)

That said, with a quick Google search, this article came up. Many of these games I would not have thought about as couch-coop or split screen types.

I've been playing Overcooked 2 with my siblings and it's been a BLAST! It's fun, silly and chaotic with enough of a goal to have something to aim for (if you like to tryhard) or just goof around. I can't recommend it enough.